AC with resistor and AC with inductor

The peak value of ac voltage on a 220 V mains is

• $200\sqrt{2}$

• $220\sqrt{2}$

• $\frac{220}{\sqrt{2}}$

• 220

The phase relationship between current and voltage in a pure resistive circuit is best represented by

• 
• 
• 
• 

Which of the following graphs represents the correct variation of inductive reactance XL with frequency u?

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• 
• 
• 

A resistor is connected to an AC power supply. On this circuit, the current

• leads the voltage by 90°.

• lags the voltage by 90°.

• is in phase with the voltage.

• none of the given answers

A pure inductor is connected to an AC power supply. In this circuit, the current

• leads the voltage by 90°.

• lags the voltage by 90°.

• is in phase with the voltage.

• none of the given answers.

If the frequency of the AC voltage across an inductor is doubled, the inductive reactance of that inductor

• increases to 4 times its original value.

• increases to twice its original value.

• decreases to one-half its original value.

• decreases to one-fourth its original value.

The formula for inductive reactance is

• $\frac{1}{\omega L}$

• $\omega C$

• $\frac{1}{\omega C}$

• $\omega L$

The formula for inductive reactance is _____.

• XL = 1 ÷ 2πfL

• XL = 2 ÷ πfL

• XL = 2π ÷ fL

• XL = 2πfL

What is the Peak voltage of the signal shown on the multimeter?

• 1000 V

• 1414 V

• 1500 V

• 707 V

A sine wave has a peak value of 354 V, What is the RMS value?

• 250 V

• 500 V

• 354 V

• 200V